One in four Iowa Republican voters remain undecided, a new survey in Iowa finds.

Former Arkansas Gov. Mike Huckabee and U.S. Sen. Rand Paul are the two most popular Republican potential presidential candidates among a list of 11 names, a new survey in Iowa finds.

But one in four Iowa Republican voters remain undecided, the survey found.

The one-day telephone survey 402 Republican voters was taken was March 30 by WPA Opinion Research.

"What's interesting here is that for Gov. Huckabee, the majority of his support is being driven by voters 55 years or older," WPAResearch CEO Chris Wilson said in a news release this morning.

"It also illustrates the wisdom of Senator Paul's strategy of investing significant time into bridging the generational gap and reaching out to younger voters," Wilson said. "If successful, that could make a big difference in who ultimately wins the Iowa caucus."

Asked who they'd vote for if the GOP caucuses were held today, the poll respondents said: